How Much Did You Lose in Total?

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Your Rs. 500 fell out from your pocket and someone picked it,
The Person who picked it happens to owe you Rs. 100,
So, The Person paid you the Rs. 100 with the Rs. 500 and
You gave him back a change Of Rs. 400.

A man walked to a store with a fake 1000 note.
He changed the note to two 500 notes from the sales attendant.
He later went back to the attendant to pay for a 300 worth of goods
using one of the 500, and collected 200.
How much did the store lose?

A man walked to a store with a fake N1000 note. He changed the note to two N500 notes from the sales attendant. He later went back to the attendant to pay for a N300 worth of goods using one of the N500, and collected N200. How much did the store lose?

A Lady (L) bought an item of Rs 100 from the Shopkeeper (C). She paid him through a 500 Rs Note. Realizing that he did not have change, the shopkeeper (C) got change for that note from another Shopkeeper (S) and paid Rs 400 to the Lady. After a few days, Shopkeeper (S) realized that the note is fake, and this railed at Shopkeeper (C) and took 500 Rs back from him.
So in this whole process how much money did Shopkeeper (C) loose in the end?

A shopkeeper decides to give a discount of 20% + 30% on the printed price of a watch, but unfortunately the printed banner comes with the print as 30%+40% discount. If he gets a gain of only 5% of actual cost of watch in this new structure then how much profit in a actual cost did he decide to get in the earlier structure.